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X in (-oo:+oo)
X/12 = 15/8 // - 15/8
X/12-(15/8) = 0
X/12-15/8 = 0
1/12*X-15/8 = 0 // + 15/8
1/12*X = 15/8 // : 1/12
X = 15/8/1/12
X = 45/2
X = 45/2
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